Palaeogene

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Palaeogene Period
66–66 million years ago
Mean atmospheric O
2
content ower period duration
c. 26 vol %[1][2]
(130 % of modern level)
Mean atmospheric CO
2
content ower period duration
c. 500 ppm[3][4]
(2 times pre-industrial level)
Mean surface temperature ower period duration c. 18 °C[5][6]
(4 °C above modern level)
Key events in the Paleogene
view • discuss • edit
-65 —
-60 —
-55 —
-50 —
-45 —
-40 —
-35 —
-30 —
-25 —
N. Amer. prairie expands[7]
First Antarctic permanent ice-sheets[8]
An approximate timescale o key Paleogene events.
Axis scale: millions o years ago.

The Paleogene (informally Lawer Tertiary) is a geologic period an seestem that spans 43 million years frae the end o the Cretaceous Period 66 million years ago (Mya) tae the beginnin o the Neogene Period 23.03 Mya.

References[eedit | eedit soorce]

  1. Image:Sauerstoffgehalt-1000mj.svg
  2. Image:OxygenLevelsThroughEarthHistory.png
  3. Image:Phanerozoic Carbon Dioxide.png
  4. Image:CO2LevelsThroughEarthHistory.png
  5. Image:All palaeotemps.png
  6. Image:TemperatureLevelsOverEarthHistory.png
  7. Retallack, G. J. (1997). "Neogene Expansion of the North American Prairie". PALAIOS. 12 (4): 380–390. doi:10.2307/3515337. JSTOR 3515337. Retrieved 2008-02-11. 
  8. Zachos, J. C.; Kump, L. R. (2005). "Carbon cycle feedbacks and the initiation of Antarctic glaciation in the earliest Oligocene". Global and Planetary Change. 47 (1): 51–66. Bibcode:2005GPC....47...51Z. doi:10.1016/j.gloplacha.2005.01.001.